Bone densitometry is a 20-minute exam used to measure the bone mass in your body. Your doctor will use the results to help decide on a treatment if you are at risk of bone fracture.
While you are lying down without moving, the moving device sends an invisible beam of low-dose x-rays to your body. The resulting data is transmitted to a computer. An x-ray of your back is also performed in order to complete the exam. The results are combined and analyzed by a radiologist.
Preparation for your exam
Avoid taking calcium and/or vitamin supplements on the day of the exam. Do not undergo any exam that requires the use of baryum (such as baryum enema, upper G.I. or lower G.I. exam) or any nuclear medicine exam during the two weeks before your exam.